Previous subsidiaries include Michigan Air-Line Railway and Railmark's Rail Entertainment USA.
The Railmark Track Works subsidiary supplies a line of bio-based, biodegradable rail curve and switch plate lubricants.
RAILheat utilizes an environmentally safe and energy-efficient Far Infrared (FIR) technology that is designed to prevent freezing in railroad equipment and operations.
The merger provided Railmark with greater access to capital as a public company, while TTHX acquired more shareholders who work in the railroad industry.
[3] In January 2017, it was announced that Railmark had acquired Yreka Western Railroad, a railway line operating in Siskiyou County, California.