John, yes I believe it is YN3 though it has been superseded by the 'boxcar' style which is basically the same colours but different logos on the side.
I personally prefer the hockey stick YN2, especially the monster AC60CWs where CSX filled the letters in with yellow. I only ever saw one back in 2013, I didn't know about 'Rachels' until I drove past and nearly crashed. CSX stabled the engines for the afternoon R170/Q170 doublestack train there, it's out of the way so park in Rachels car park and wander around taking close ups, unfortunately the wife wasn't so impressed when she found out 'Rachels' was an all day lap dancing bar and club!
R170 is the designation if the train runs south, Q170 if it runs north.
The intermodal hub at Taft was part of a balloon track, the southern leg always went south, the northern leg had a wye so trains could turn south or more normally go north,

Therefore, engines sat at Rachels could go in either direction and it changed day by day, as did the time, sometimes it was around 12:00 but the latest I watched was 15:30. These light engines are going to turn left and south as they cross over the crossing outside Rachels; the road crossing being the main north south route through Taft.
The intermodal yard was small and only held 60 cars on three lines but R170/Q170 was normally loaded to 120 cars, which means that the front half has to be drawn out of the yard and then backed up to the second half, air pumped up (easily 20 mins or so) and then the whole train drawn out onto the siding if heading south. If going north then Q170 just goes. The problem is that the southern exit is covered by at least six crossings and R170 blocks them all.
If your rail fanning you have to first find out if the train is going north (Q170) or south (R170) and if south, make sure you are clear of the main exit crossing before the first half draws out.
If not you'll never get south in time to take any more photos, your just grid locked until the train leaves, there is one way around the back through back streets and industries, but it takes a good 30 mins and chances are R170 is long gone by the time you get round.
If the train uses the northern exit you can only really get good photos from Rachels car park, if the train turns south then your in luck as you can swing south and catch it further down the line, if north your just stuck there and even once the crossing clears it'll take you a further 20 minutes to fight through the traffic that's all backed up.
CSX 907 rolls Q170 past Rachels and then swings north.
The only other option for north bound trains is to make sure you're the other side of the line but then you're shooting into the sun at Rachels and there's a whole load of visual obstructions, but you can get some half decent shots as it comes round on the balloon track out back.
Then you have to hope it does turn north, if it does your traffic free pretty much all the way up to down town Orlando, if it turns south your stuck by the crossing at Rachels, this one turned north so I managed a few more shots up the line.

The train is just clearing Taft yard limits but the tail end is still coming over the crossing at Rachels.
Q170 rolls along through Edgewood, speed on this section is slow due to all the crossings, typically no more than 30mph but once it hits down town Orlando its about 15-20mph.
Running south R170 keeps to the siding and then swings onto the main about two miles south of Taft and can then get up to track speed. About two miles after that is a nice road crossing showing the gentle grade up to Meadow Woods, by that time the big '6' was well on the move.
With 6000Hp on tap she is already up to a good 40mph in run 8 as it stomps across the crossing traction motors whining in defiance.
As it heads toward the summit
By the time the tail end passes me it's up to 60, not bad for 120 cars loaded to over 10,000 tons and near 6500' long.
I had a nice long chat with an Ex CSX inspector, then working for the new SunRail commuter line construction, he said big '6's didn't actually move, they stood still and dragged the world beneath them.
Shortly after I left news broke that CSX would close Taft intermodal (though the autorack yard would remain and expand into the old container yard), much to the delight of local residents for whom Taft means 'Train After Frickin Train'. A new intermodal yard opened further south near Winter Park and now the mad dash or engines tied down at Rachels is a thing of the past, I'm glad I got to experience it.
Q170 normally heads north through down town Orlando and doesn't clear city limits until well past Sanford, best part of 35 miles at 20 mph, there are further restrictions on the way north and then another grind through lower Jacksonville.
R170 (re-routed Q170) heads south down the old A Line to Lakeland (more on there in a later update) where it will swing north and head up to Vitis to join the S line. From there it's up to Wildwood, Ocala and finally Jacksonville, quite a round about route and about 95 miles longer, but because most is at 60 mph it was often faster then going as Q170.
In 2013 the new SunRail project was being built, a new commuter line from Taft to Longwood north of Sanford. This required frequent engineering possessions and they had to a tight time table to fit in between trains. Most freights were delayed or re-routed but the Amtraks had to pass through what ever. By 2015 it was all up and running and very impressive I must say and I now see it's being extended further south to Poinciana and north to Deland.
MD