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.

A crew member throws a switch for the Hudson Terminal Railroad's Alco S1.

Hudson Terminal Railroad's #646 (Alco S1) heads to the yard to get a cut of oil cans repositioned in the terminal at Hudson, Colorado.

A veteran Alco S1 working at the Hudson Terminal Railroad muscles a cut of oil cans onto a siding.

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

The 78-year-old Alco S1 still makes bank for the Hudson Terminal Railroad as it works the yard in Hudson, Colorado.

The Alco S1 which operates for the Hudson Terminal Railroad moves a cut of oil cans to a ready track for pickup by the BNSF.

This 78-year-old veteran works a terminal in Hudson, Colorado. The Alco S1 was built in 1946 for the Detroit & Mackinac Railroad and later operated with the Lake State Railway Company.

Hudson Terminal Railroad's veteran # 646 (Alco S1) runs through the yard next to vintage passenger cars which are stored at the terminal.

A crewman from Hudson Terminal Railroad's #646 (Alco S1) throws a switch in the yard where the engine will sort tank cars.

HTR 646 is a 77-year-old veteran working with the Hudson Terminal Railroad in Hudson, Colorado while the first snow of the season falls on the Front Range. The Alco S1 was built in 1946 for the ... (more)

HTR 4027 (Baldwin RS4TC) shuffles a string of oil cans at the terminal in Hudson, Colorado.