Having recently done a 36" door layout for 6 trains (4 running at any given time) I have developed a fondness for short trains (so they fit in the sidings). My best realistic short trains are beeps with an 027 car and caboose, Thomas, K-line hand car with water trailer, and Lionel Army switcher with 4 K-line mini hoppers.
On my 031 loop, usually a steamer and a boxcar or 2 then a caboose. I did put the polar express on it for giggles. It’s not too bad since my mountain hides about half the track. I see a B&M beep in my future.
Here’s some beeps: http://store.yahoo.com/readymadetoys/o-gauge-diesel.html
My shortest train is my “gandy dancer” . He is about 1" long. My 6 yr old son has a blast watching the two guys pump their arms out. He like to make them go fast. It is hillarious.
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We also run Thomas and the two coaches annie and clarabelle. Also Percy and two troublesome trucks.
zw, gotta get that Miller to the bar in a hurry. I like that consist. I think I have you all beat - I run an old 2-4-2 whose tender is twisty-tied to a single car from a 1701 streamliner (thanks Bob!) - it’s my passenger train.
Years ago, I got a set of K-Line Budd Cars. Needless to say, I pulled 'em apart, made my standard modifications, repainted a couple, took one motor out of the lead and put that along with another motor in the other dummy units.
So I run my single Budd cars as a one car train, though with my modifications, they’ll easily pull a bunch of passenger cars should I wish.
When I first set up my Christmas layout, my test train just consists of my GP7 and a caboose.
When all the testings done, the shortest train I run is a set from 1948 (?), consisting of a gondola, boxcar, flatcar, & caboose.
However, I rarely settle for so few cars. In recent years, I’ve added a modern tanker car, MTH Hellicopter car, and a second caboose, to make 7 total cars.
My longest train is my modern Wabash passenger train, that pulls 12 madison cars. Once in a blue moon I’ll stick all 19 cars behind the modern 4-6-4, but not for very long.
On my industrial spur I have an Atlas SW-1200RS with a single tank car. It’s set up with a Pocono Mountain Lines controller so that it continuously runs very slo-o-owly from one end of the spur to the other and back. On my wharf track I run a K-Line Plymouth switcher with a single boxcar. The engine’s small size looks great in that setting.
Typically, I try to run as long a train as I can, as I only had a starter set (engine, flat, gondola, hopper, caboose) with one extra flatcar for my trainset as a kid. That said, one of my favorite trains to run on my layout is a 2016 (with added smoke unit) with tender, five or six 6014 style boxcars, and an SP caboose (usually my 6457).
When I lived in my apartment, and only had a 3 x 6 layout, I would usually run a train with an engine, 2 cars, and a caboose. The engine would be no bigger than the 2016 for steam, or a GP9 for deisel. The cars would be short boxcars (6014 style), short gondolas (6012? style), or short flatcars (no idea what cat. number they were). The caboose would either be an SP 6017, or an MPC bobber.
Of course, my curent layout has an elevated trolley line, that either runs an MPC era Budd car, or a Bowser trolley (one of the best values in O gauge today, IMHO), but I don’t feel a single unit qualifies as a train.