The description of one Alco S2 will suffice for all of them.
It was a 1000 hp switcher with Alco's Blunt trucks, powered by Alco’s 539 turbocharged, 6 cylinder diesels,
Number 20, along with her sister number 21 were part of order S-1892 from Alco. The two S-2s cost $53,000.
Each supplied a tractive effort of 57,000 lbs, just slightly more than twice what the most powerful and efficient of the steamers could do.
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