They ran smoothly and noiselessly on account of the absence of reciprocating parts.

They consumed current only when in use.

They could be installed and connected with a minimum of trouble and expense.

They emitted neither smell nor smoke.

Edison built an experimental electric railway line at Menlo Park in 1880 and proved its practicability.
Meanwhile, however, as he worked on his motors and dynamos, he was anticipated by others in some of his inventions.