THE CASH RAILWAY WEBSITE
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MEXICO CITY. James H. McLeod, Coliseo Viejo 13. "Grand opening of James H. McLeod & Co. New premises Coliseo Viejo 13.... See the new Cash Railway, the first in the city." Mexican Herald, 17 Jan. 1897, p. 5
indicates systems which are still there (as far as I know) though they may not be working.