oh. OK, so you really can only orient the way you had it. You should def add supports though to reduce the sagging.
Matt, Slice off the end and print flat on the build space. then print the “U” shaped Car body vertical.
install your supports in the “Horizontal” portions.
As far as slicing a drawing STL/OBJ file I use the 3DBuilder program then import into Matter Control program. When I get the item on the matter control program you can fine tune the part using the “percentage” scale and review the size from a know drawing of the Car etc.
I save every file I modify so I can repeat down the road.
This has worked well for me.
Howard
Great job Matt!
In additional to all the good advice, here’s another thought…
If you have the space, an option is to tip the thing ~30 degrees. This lets any “ceilings” to gradually build up, vs. starting from space and having nothing to hang onto.
And, well, supports are important. But for a truly flat ceiling in a part, even with supports, “diagonalizing” it helps.
One way to think about it is tearing away a cured sheet from the build plate. With all that surface area, it’s tough to do that, all in a fraction of a second. But a thinner strip being pulled away, that’s easier. So, sloping an object can reduce the tear-away area a lot, and improve a print.
Cliff
Matt,
Remember it’s just a gondola so it’s supposed to get beat up anyway…
Only my opinion and Hollywood laughs/talks too much 
!
Hi Dan,
Okay, sounds like a good idea. I will give it a shot later today.
Cheers,
Matt
Thanks Howard, That’s an excellent suggestion. When I fire up the printer today that’ll be the first print.
Cheers,
Matt
Thank you Cliff. I may try your 30 degree tilt idea!
Geeze Rooster, I was only gonna maybe build three of 'em, and now I need very many more! 
Cheers,
Matt
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Thanks to all the tips here, it’s gonna work. It takes about six hours to print a two panel segment. Here’s my progress since yesterday morning:
Printing the end flat by itself worked fine, but the end began to warp a bit after curing. Is the car going to be perfect? No, but it’ll be a more than adequate model when painted and lettered.
Cheers,
Matt
Hi guys,
Here’s where the thing stands today. One of the sides broke while being wrestled off of the build plate - you can see the break line. Still needs some trimming and sanding:
On Friday the bottom doors will get printed, along with all of the other remaining parts.
Cheers,
Matt
Hi guys,
Here’s an update on weekend progress.
The intent of this project is to end up with a passable version of this:
As of this morning my model looks like this:
Its real trucks will be Kadee #970, scheduled to arrive today. Lettering to be applied over the next few days, along with couplers.
All in all, this was a lot of work. It took a great deal of printing time, along with a lot of resin. Some prints were very fragile, and others had some warpage and weird curved edges. I probably will not build another. Due to print area limitations, the carbody had to be printed in four segments; if I had a printer that could do the carbody build in one piece, I’d give it another try. Still, it’ll end up looking better than this pic of a prototype near its end of service ;):
Cheers,
Matt
Matt. You hit upon two of the biggest problems I have with resin printing; size constraints and fragility. I am seriously considering a filament printer to do the larger pieces that need strength and then using the resin parts for details.
But the car did come out great. I can’t wait to see it with the proper Kadee truck.
Thanks Devon. I had problems getting some of the floor pieces to print correctly. Since I am planning to finish this with a load, those issues don’t matter:
I also had a problem on the inside of the end that was printed with a body section - you can see where I whittled it down a bit:
Here’s the car with the correct trucks and some of its lettering:
Cheers,
Matt
Well, even though you pointed out the problems, I can’t sen anything that doesn’t look real in that last photo. Great job.
I’m pretty jealous of you backdrop skills 
Thanks Jon. One of my main motivations in getting into large scale years ago was the fact that I wouldn’t have to build scenery or paint backdrops anymore!