Hudson Terminal Railroad's vintage Alco S1 heads to a string of oil cans in the larger terminal in Hudson, Colorado.

Hudson Terminal Railroad's Also S1 moves among the oil cans in Hudson, Colorado.

Hudson Terminal Railroad's #646 is an Alco S1 built in 1946 for the Detroit & Mackinac Railroad. It later worked for the Lake State Railway Company.

Hudson Terminal Railroad's Alco S1 moves a cut of oil cans in the large yard in Hudson, Colorado.

Hudson Terminal Railroad's Alco S1 move a cut of oil cans at Hudson, Colorado.

Hudson Terminal Railroad moves through the yard at Hudson, passing some vintage passenger cars as it heads to a string of oil cans.

Hudson Terminal Railroad's #646 (Alco S1) heads west to the yard of oil cans as a BNSF freight heads east on the Brush Sub.

Hudson Terminal Railroad's Alco S1 works the yard in Hudson, Colorado sorting oil cans at the terminal.

Hudson Terminal Railroad's #646 (Alco S1) moves a cut of oil cans in the yard at Hudson, Colorado.

A crewmember of Hudson Terminal Railroad's #646 (Alco S1) throws a switch at in the yard.

Hudson's Terminal Railroad's Alco S1 works the oil terminal in Hudson, Colorado.

Hudson Terminal Railway's veteran Alco S1 moves a cut of cars in the yard at Hudson, Colorado.

Hudson Terminal Railroad's #646 (Alco S1) works a string of oil cans in Hudson, Colorado.

Hudson Terminal Railroad's Alco S1 runs through the yard to get a cut of oil cans.

Hudson Terminal Railroad's Alco S1 runs past a vintage heavy weight passenger car in Hudson, Colorado.