Loco or Train No. Device that Failed Location Collision or Derailment? Cause /25/1995 SP CTC Amtrak No. 6 Signal 7274 East Riverton, UT N

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1 IronWood Technologies Railroad Accident Reconstruction Federal Railroad Administration False Proceed Signal Database January 1, 1995 through May 3, 2004 All Reports - State of Utah s 508 8/25/1995 SP CTC Amtrak No. 6 Signal 7274 East Riverton, UT N Failed Equipment or Device - Interior Wiring On August 25, 1995 at approximately 7:00 AM, Engineer operating Amtrak train no. 6 traveling east, reported that signal 7274 at the East End of Riverton displayed Green over Yellow on the same signal head, when signal should have been Green. The Signal Maintainer inspected the signal system and found that behind the cable board, in the junction box, the HG and DG wires were pinched together and shorted, thus causing the signal to display Green and Yellow at the same time. The wires were separated and insulated. The signal system was tested and found to be working as intended with no exceptions. The signal system was returned to service on August 25, 1995 at 10:00 AM /28/1995 SP CTC SP 1SGSNC-27 Signal 6598A East Gilluly, UT. N On August 28, 1995 at approximately 7:25 AM, Engineeroperating train no. 1SGSNC-27 traveling east, reported that as they were heading towards the East End of Gilluly, signal 6598A was Red, but as they got closer, the signal looked Yellow. The train proceeded but found the switch lined against them. Under the direction of the Signal Supervisor, the signal system was inspected and thoroughly tested. All tests showed the signal system to be working as intended with no exceptions. The following morning, at the same time of day, the Signal Engineer and Signal Supervisor returned to the location for a visual inspection and observed that the early morning sun, shining on the signal, caused the Red aspect to look Yellow. A phankill unit was installed, and the problem was eliminated. The signal system was returned to service on August 28, 1995 at 2:00 PM. Copyright No portion of this compilation may be sold or added to any other information product intended for sale. Page 1 of 5

2 s 52 11/28/1995 CSXT NPST-26 None Orinosa, Utah N On November 28, 1995, at 13:45 (CDT) on the Elko Subdivision, westbound train NPST-26 had a Green aspect at Signal No , a Flashing Yellow aspect at Signal and a diverging Red over Lunar aspect at Signal CP F826. An investigation revealed the signal case at MP had been run into by a vehicle and upset relays RLPR, 180CTR, and DRAR which had to be replaced /11/1998 UP CTC UP 8197 None Colton, UT N Loss of Shunt - Possible Rust or Foreign Material on Rail On March 11, 1998 at 2300 MST, on the Provo Subdivision at Colton, Utah, eastbound CTVSV-04, on the main track, observed the eastbound signal at MP display a momentary Green with the track circuit east of the signal at MP occupied. An investigation revealed momentary loss of shunt in the occupied track circuit east of signal at MP caused the momentary Green signal at eastbound signal at MP All applicable tests were performed /27/1998 UP CTC UP 8266 None Midvale, UT N Human Error - Field Wiring Error, Inadequate Service Testing On August 27, 1998 at 15:46 MDST, on the Provo Subdivision at Midvale, Utah, westbound 1 RUT611 27, at Mile Pole 26.30, had a switch lined under him while he was occupying the OS circuit. An investigation revealed that an OS track relay was not wired into the OS track repeater, which allowed the switch to be lined while the train occupied a portion of the OS circuit for that switch. Copyright No portion of this compilation may be sold or added to any other information product intended for sale. Page 2 of 5

3 s /25/2000 UP AB CSXT 8670 None Ogden, UT N On October 25, 2000 at 13:30 MDT in Ogden, Utah on the Lakeside Subdivision, westbound ZAPT 25, on the main track, reported the westbound Signal was Yellow with the track circuit west of the signal occupied. An investigation revealed a road grader had struck the instrument case at MP and tipped over the track relay for the track circuit west of westbound Signal /9/2000 UP CTC AMTK39 None Ironton, UT N On November 9, 2000 at 06:31 MST in Ironton, Utah on the Provo Subdivision, eastbound AMT6-08, on Track #1, reported the eastbound approach signal at MP to Ironton displayed a Green aspect with the crossover in Ironton lined and occupied. An investigation revealed the signal case at MP had been struck by a vehicle on the service road and the 98H and 98D relays were upside down /5/2001 UP CTC UP4128 None Ogden, UT N Human Error - Field Wiring Error, Inadequate Service Testing On April 5, 2001 at 12:20 MDT, at Ogden, UT on the Lakeside Subdivision, westbound AKSBEX 03, on the main track at MP , reported a Yellow over Red westbound signal at MP with the next block occupied. An investigation revealed that the eastbound and westbound signal control wires were connected together at the 7577 track relay. Copyright No portion of this compilation may be sold or added to any other information product intended for sale. Page 3 of 5

4 s /4/2002 UP CTC UP 4598 None Lehi, UT N Human Error - Signal Circuit Design Error, Inadequate Service-Testing On November 4, 2002 at 16:30 CDT, in Lehi, UT on the Provo Subdivision, westbound MWCOG-01, on the main track at MP , reported that the westbound absolute signal at West Mesa was Flashing Red into a "Track and Time" permit. An investigation revealed a circuit error that permitted the Red indication to flash without the signal being requested. The circuit error was corrected, and all applicable tests were performed /29/2002 UP CTC UP 6573 None Wellington, UT N Human Error - Signal Circuit Design Error, Inadequate Service-Testing On November 29, 2002 at 10:02 MST, in Wellington, UT on the Green River Subdivision, eastbound CCSWE-25, on the main track at mile post , reported that the eastbound signal at West Wellington cycled from Flashing Yellow to Green with a westbound train entering the siding at East Wash. An investigation revealed that the point detector on the power switch at East Wash was failing intermittently as the westbound train passed over the reverse switch, causing the main track HD line circuit feeding west to pump. The existing circuitry at West Wash/East Wellington pole changed the HD circuit feeding west in response to this pumping action, resulting in a Green aspect at West Wellington. The circuits at West Wash/East Wellington were revised to prevent a reoccurrence of this failure. All applicable tests were performed /23/2003 UP CTC UPY562 None Salt Lake City, UT N On April 23, 2003 at 10:25 CDT, in Salt Lake City, UT on thelynndyl Subdivision,westbound YSC44 22, at mile post , reported the westbound signal on No. 1 track was Red over Lunar without the signal being requested from the dispatcher. An investigation revealed the sun reflecting off the outer lens of the bottom red aspect gave the appearance of a lunar. The outer lens was replaced, and all applicable tests were performed. Copyright No portion of this compilation may be sold or added to any other information product intended for sale. Page 4 of 5

5 s 420 7/2/2003 UP CTC UP 3382 None Salt Lake City, UT N On July 02, 2003 at 22:15 CDT, in Salt Lake City, UT on the Lynndyl Subdivision, eastbound UGDEO, on the side track at MP , reported the eastbound signal #12 in the siding was Yellow over Red, and there was no signal requested and the switch was lined normal. An investigation revealed the outer magnifying lens of the top signal head was not properly sealed to the inner lens, and the angle of the sun caused the Red indication to appear Yellow/Orange. The lenses were cleaned, resealed, and all applicable tests were performed. No. of Reports Shown in this Listing: 12 Copyright No portion of this compilation may be sold or added to any other information product intended for sale. Page 5 of 5