I'm strangely late to this thread. I've been busy editing 130GB of video from... oddly enough... my recent 3 week trip to Tehachapi Pass that included the 4-day California Railfan group yearly meet up there.
Since this route is my favorite section of track in the world, of course it's a must buy for me! It's shocking it took this long for an official version of this route to come to Train Simulator. I have the route for MSTS, Trainz, Run 8 and Marc's version for TS. Looking past some of the flaws (for example.. the water tank at Tehachapi is missing), this route otherwise looks pretty darn good!
Tehachapi Pass has it all.... It's very busy, has steep grades (up to 2.9% at times... 2.2% is just the average of the pass), a total of 12 tunnels, the loop, a decent amount of single track choke points ( so you don't miss anything), great access to most of the route and not much foliage blocking your camera shots.
It easily has the most derailments than any other mountain pass grade in California. That's due to it's sharp, snaking S-curves. Originally the rated speed limit on the concrete ties was 25mph, but UP wanted only 22mph to reduce derailments. BNSF complained and UP compromised at it's current 23mph. BNSF sends more trains over the pass than UP does by a factor of 4 to 1. So you can see why they would complain.
I think the inclusion of a GP40-2 with this route is very odd. Southern Pacific owned them and they have long since left road service over the pass. Not that many were used over it in the first place. The San Joaquin Valley railroad has GP40-2s on the roster, but there is no indication that SJVR has been licensed for this route. They stick around the Bakersfield UP yard and don't venture anywhere near the pass.
I'm curious as to when the route is exactly modeled. Does it include things like the CP Cliff siding extension and the double tracking of CP Walong through CP Marcel from about 6 years ago? Either way... I'm getting it.
Had a great time up at the pass. The Cal Railfan group is the only one with inside loop access from the Loop Ranch. The ranch manager has been there since 1967 and we have a good relationship with him. We repaired the vandalized railroad memorial monument the best we could and landscaped the area. Of course we watched and filmed hours of trains there.
Highlights of the trip for me....#1: A BNSF grain train with 4x4x2 power. Normally they are 3x3x2.#2: A BNSF grain train with a Canadian Pacific leader.#3: A very unusual 50/50 UP manifest train with all UP power upfront (2x SD70ACEs and an SD60) and all BNSF DPU power at the back (ES44DC & ES44C4).#4: Saw two Progress Rail SD70ACe-T4 lease units (one yellow, one black).#5: A BNSF train with CP and CN units on it.#6: A BNSF scale car at the back of the train with an EOT on it.There was slow orders for awhile at Bealville that had trains creeping through Tunnel #5 (the longest on the route). This kept the engines in the tunnel an extra long time and created massive amounts of smoke when they exited. Hadn't seen those levels of black smoke out of that tunnel since the 1970-80s era. A real treat!
Also had a sun kinked rail at Bealville horseshoe curve that stopped traffic for hours until it was fixed. It was 100°F+ on the pass for a few of the days.
Talked to an old Santa Fe road engineer (1970-2006) in Bakersfield. Said they used to drink beer on the job regularly in the 70s.

It was only a matter of who's turn it was to buy the brew on each shift for the cooler. Those days are long gone!
