I'll admit I scanned the history of Diesel engines, but it makes sense how the current status quo came to be.
I've edited it a bit to hopefully make it easier to read, but condensing 70+ years of US diesel loco history into a few sentences isn't easy
It's a sobering thought that the one remaining loco (in a museum) from the original EMD FT four-unit demonstrator set is now 75 years old - 11 years older than any BR standard
steam loco. In historical terms it's almost as significant as Stephenson's Rocket, in the sense that it convinced the railroads of the day that diesel power could out-perform any steam loco then existing, and with lower running costs i.e. that diesels weren't just toys to pull flashy lightweight passenger trains, but serious tools for moving freight economically.
EMD seem to be shooting themselves in the foot again - having put all their hopes into redesigning the two-stroke 710 engine to make it Tier-4 emissions compliant, they failed, so now they've had to design a new 4-stroke '1010' series engine to power future US freight locos. Trouble is, GE are shipping production versions of their new T4 compliant 'ET44' loco (I saw a pair of them on a BNSF freight), whereas EMD have only just rolled out the first few 'demonstrator' SD70ACe-T4 units (customer test units, really), so they are probably at least a year behind GE, with no freight loco design to sell in their home market at the moment...
Incidentally, the new GE ET44's could be an American 'shed' - look at the shape of that huge radiator

(
picture from Jonathan Camacho at www.rrpicturearchives.net)
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Meanwhile, back with the Tehachapi trains...
Day 4 - Part 2, A relaxed Sunday afternoon on Tehachapi
After enjoying breakfast part 2, I decided it was time to visit the curve east of Cable -
https://www.google.co.uk/maps/dir/3...35.1377485,-118.4775678,17z/data=!4m2!4m1!3e2
This involves parking in the Meadowbrook Park lot, then walking half a mile through the park down to the line. Sod's Law being what it is, an eastbound (uphill) intermodal goes past when I'm half way down the path

. Oh well, there'll be another one along soon (based on the day so far). I wait, and wait, and wait... Then I hear some odd noises in the scrub nearby, and realise that a family of deer are making their way down the valley towards the railroad. Trying to take some decent photos of them keeps me occupied for a while - one of them seems to be a hopeful train-watcher too:
Still no trains - I try my hand at photographing the blue California 'Scrub Jay' birds that keep flitting about, but they prove too camera-shy (as soon as one is close enough, by the time I've got the camera on it, it's gone...).
Eventually I hear distant train horns - hurrah! - it's a westbound (downhill) train, but I'll take anything at this point, so with 'all the sixes' leading here it is:
Time to move on - I walk back to the car and drive down the Woodford-Tehachapi Rd to see if anything else is about (with a quick side-trip to the lineside at Marcel so I know the way for later). No trains to be found, so I have lunch in the 'Keene Cafe' -
https://www.google.co.uk/maps/place...97,15z/data=!4m2!3m1!1s0x0:0x2d41a6e6e1783186 - good food, and if you can cope with the hot sun at the outside tables, you can at least hear the trains as they climb the hill (the line is about 400m away). After lunch I drive back up to Woodford Siding just in time to catch this UP 'autorack' train thundering upgrade (GE ES44AC and two EMD SD70M):
As I've never photographed a train at Marcel, I make my way back there to await the arrival of the UP train. It rounds the curve:
...then a close up view of an ES44AC:
...and finally the DPU makes it's way around the S-curve:
The sun is starting to sink towards the hilltops by this time, but that makes for interesting 'light and shade' shots, so I turn around and drive down to Bealville. After a short time a seven loco lash-up on the front of a BNSF mixed freight climbs towards me:
...complete with a somewhat ratty-looking 25 year old GE B40-8W still in Santa Fe 'Warbonnet' red and silver livery:
...and a C44-9W in a rather travel-stained BNSF version of 'Warbonnet' paint:
Incidentally, the driver of the car in the picture above reversed back from the crossing when he saw my camera, so as not to spoil the view - I waved a friendly greeting
We haven't got to the end of the day yet, so more to follow...
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Day 4 - Part 3, The last evening at Tehachapi
I carry on over the crossing down to the bottom of the hill, then turn left onto the road up to Tunnels 1 & 2. I noticed yesterday that if you stand in the right place, it's possible to see the railway on both sides of the creek, since the line does a 180 degree U-turn as it passes through Caliente village i.e. if the train is long enough you can see both ends of the train simultaneaously moving in opposite directions
I don't have to wait long before hearing the noise of an approaching train, but in the meantime I finally manage to photgraph one of the elusive birds!:
A BNSF double-stack train curves into Caliente (out of shot to the left):
...and starts climbing up the creek towards Tunnel 1:
...until both ends are in view:
...and a bit of light and shade:
(The whole sequence is on video here -
https://www.youtube.com/watch?v=t7EM3OAaIrg )
As things are a bit quiet (and the sun is sinking), I decide to use the remaining daylight to chase the train up the pass, so a final 'Bealville Sunset':
and the east end of Woodford Siding (one of my favourite photos of the whole trip):
A 'camera's eye' view of double-stack size versus Mazda 3 - it's about 20 feet from rail level to the top of a double-stack. Those are 53 feet long 'domestic' containers on the train - BNSF is a major carrier of traffic for the big US trucking companies (like J.B.Hunt) between the west coast and the mid-west - it's cheaper than trucking them over that distance:
Looking down onto the west switch of Marcel Siding, just after the Loop and Tunnel 10 (the CA-58 freeway is in the background):
Although it was tempting to try and catch the train at Cable, I decided I might not get there in time (since it involves a reasonable walk from the car park), so I went for a final shot of the train approaching downtown Tehachapi:
So that's all from Tehachapi (after a great two days there) - tomorrow morning it's time move 'base camp' and head many miles north to Donner Pass
