Pay to play
Trains malfunction frequently and more than half of earned money goes to repairing trains. At first I was paying to an engine about 1.3K but know I am paying about 6.5K for same engine. You need to pay for develop otherwise progress takes 3-4 years, seriously. Also I can tolerate “some yokel was using engine for target practice” but software problems on a steam engine? Steam engine needs firmware update? what the hell!?..