Just a heads up that about 24 miles of ABS/TWS (aka Rule 271) on the Union Pacific Julesburg Sub in northern Colorado is being converted to CTC as BNSF takes over maintenance of the entire Bush Sub/Julesburg Sub corridor between Union and Sterling, CO. This line represents one of those dual operating arrangements where as traffic levels dropped, two competing railroads turned their parallel lines into a single joint. In the case of the Bush and Julesburg Subs, the division point was the small railroad location of UNION.
Over the last decade or so BNSF upgraded their side of the line and, as their traffic levels increase, they gained more control and have decided to apply CTC to the Union Pacific portion of bi-directional ABS. Although Union Pacific ABS signaling had eliminated use of the pole line and installed PTC, it also made use of short mile long signal blocks with US&S N type color lights at mileposts 77, 70, 69, 67, 66 and 65 in addition to fairly uncommon late model US&S modular color lights at mileposts 71, 72, For example the CTC interlocking replacing the ABS hand throw siding end at MP 58.8 in Sterling will have its distant at the MP 61 signal location. Union Pacific appears to have already been reducing the block length with 2 mile jump to a new Safetran signal at MP 63. The project will also include new interlockings and the currently hand throw searchlit ABS siding between WE and EE MESSEX and two new intermediate signals at mileposts 79 and 78 between MESSEX and UNION.
It remains to be seen if BNSF will remove/replace all of the old UP intermediates or just those directly adjacent to one of the new interlockings, but for anyone in the area all of the existing signals are easily accessible from public highways including US 6 and County Rd 178.
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