Here is a must-see collection of Diesel-electric locomotive modeled by members of the Western Prototype Modelers meet (WPM) 2003 - La Habra, CA.:wave: They are tons of HO scale Athearn, RailPower Products, Atlas, etc locomotives in all stages of construction, detailed shots of areas that you never see together.
Find the Leslie S-5 SuperTyphon & S-3 horns released by Details West...you get a good look at the size of the horn(of course the 5-chime was used by the SCL, Industries locomotives, and were mixed into the Family Lines System and ultimately the Seaboard System locomotive orders).:hehe:
There are Fantasy Units, like the Santa Fe Steam era black & silver detailing...on Eric Goodman's fantasy SD75M ATSF #265.
There is a huge collection of cars & car parts shots, also Proto detailed.
I found this page on a search for EMD Radial Truck & wound up on a page (that has tons of links and a detailed explanation of the subject).
A link to a Google Images for bn 6599 will take you to websites that support the pictures posted, that lead me to the WPM meet #2003.