Historical information
A document dated June 1989 examines the then MTA tram substation network and its issues at the time, in particular the reliability of the aging rotary converters and mercury arc rectifiers. It also considers the need to upgrade the network, increase the power supply for B-class trams, and reduce voltage drop.
Significance
Yields information about the status of the tram substation and electrical equipment in 1989
Physical description
Photocopy of a 38 page A4 document.