I've really liked the MTH Premier coalporters for a long time, but the truck placement, ride height and bottom bathtub length has driven me crazy -- not for long. I've completely reworked these cars, and am in the process of reconfiguring all 55 of my coalporters.
The process involves moving the trucks outward, which also lowers the ride considerably. In addition, adding Kadee couplers gets the job done with an added touch. To get started, you need to remove the truck mounting dimple. I use a 1/2" drill bit and drill through it, completely removing it. This leaves a hole which I fill with a piece of Plastruct plastic sheet filler. (note the small holes for adding the inner slides back in place). Next, drill out a 1/4" hole into the bottom of the car where the truck is mounted. This is in line with the last rib of the car. I had to make mounts for all the kadees and they fit nicely.
Next, I got some paper thin Plastruct sheets and cut pieces 7 1/8" x 1 7/8". These will be the bottom bathtub pieces that fit over the existing, only this time they are the correct length. The trucks are placed correctly, with the wheels sticking out on the ends. I've attached some potos, showing the original cars, and my scaled out cars. In addition, I painted the ends of the cars silver on the lower portion, as MTH had the entire end solid yellow- adding conspicuity stripes and the cars are much better.
Here's a pic of the bottom showing the dimple removed, filler installed, and location of new truck placement hole. In addition are the two sheets of plastic cut and painted, ready to be fit around the bottom.
The 2nd pic shows the comparison of the bottom bathtub length...
3rd pic is the original look as delievered by MTH. Note the incorrect ride height, truck placement and shorty bathtub bottom --
4th pis is and end shot-
5th pic is the overall look of the finished product. Add a realistic coal load and you've got a nice looking coalporter.