This page is a chronicle of the fabrication and assembly of my Allen Models 1/8" scale, 7 1/2" gauge live steam locomotive.
This locomotive was started in 1987 by my father before he passed away. My goal is to have it completed by the end of 2012.
(Note: If you're looking for my video game level design page, I've taken it down, sorry.)
Prototype Locomotive, CRIP #750
Cab & Test Run - January 2012
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Started fabricating the cab today. Pieces are cut so next up is to machine out the windows and doors.
Loaded her up in the truck to take the the railroad tomorrow for another test run. Hoping this one goes better than the first.
Had a very successful test run yesterday. Made it around the railroad several times and nothing fell off! Some valve timing to tweak and some pony truck adjustment and it'll be about as good as I can make it.
Plumbing, fixes, improvements - January 2012
(click to enlarge)
After the first fire-up I brought the loco home and tore it back down to make some changes, improvements, etc. The always-faulty upper rocker arms in the valve gear are now silver soldered onto the rocker shafts, fixed front-end plumbing to the cylinders, steam breaks on the loco are done, a new Superscale injector installed, new quick disconnects to the tender, a firebox arch to prevent the bottom two flues from getting stuffed with coal ... lots of stuff! Almost ready to fire up again.
First fire - January 7, 2012
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(click to enlarge)
Today I lit a fire in the loco for the first time. Not a complete success, nor a complete failure. Had drafting troubles because of a horrible blower nozzle design (mine) as well as the grates being too high in the firbox. These two factors, combined with some really bad coal meant the bottom row of flues was getting plugged almost immediately with half-burnt, tar-like coal residue. After making a new blower nozzle and getting some good blacksmith coal, no problem getting it to 120psi with both safeties going!
There is some serious work to be done, however. I need to pull the boiler off and change the grates so they sit lower as well as try and locate some binding in the valve gear. The latter wasn't evident until everything was hot.
Of course, by the time we got the major kinks worked out, a line of thunderstorms came through so the best I could do was run it back and forth on the steaming bay!
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