Long beofre Richard Milhouse Nixon created the Environmental Protection Agency, environmental issues were a major concern in many communities, in general and animal manure was a significant urban environmental issue for cities, in particular, during the 19th century. The problems associated with animal were was one of the reasons that early transit companies adopted electric traction.

The Society for the Preservation of Carter Railroad Resources operates horse-drawn rail cars in Fremont, CA.

[www.spcrr.org]