One locomotive I've always wanted to see in Transport Fever 2 is the Great Northern W-1, which I like to call "The Big Boy of electric locomotives". These were electric locomotives used in the second Cascade Tunnel, and were built in 1947. Only 2 were ever built. They lasted for only 9 years before electrification was removed in 1956. And neither of the two survived into preservation. 5019 was scrapped in 1959, and 5018 was sold to Union Pacific to create a weird abomination, before getting scrapped as well. While the real locomotives are long gone, with my suggestion, you will likely now have these beasts on your railways.