Power is generated 11,000 volts three-phase 25 cycles and transmitted principally underground at 11,000 and 19,000 volts. The total energy generated in the two main sections at 59th St. and 74th St. for the year 1921 was 830,000,000 kw-hrs.
Substations
For supplying 625-volt direct current to the rapid transit lines, there are a total of 25 substations containing 129 synchronous converters aggregating 283,000 kw.
Distribution
Propulsion current is delivered to trains through an unprotected over-running third rail weighing, in the old subway 75 lbs. per yard, on the elevated 100 lbs., and in the new subway 150 lbs. per yard.
Rolling Stock
The motor car equipment on the Manhattan Elevated lines includes over 800 cars which have been in operation since 1902-4 with GE-66 motors and Type M control. These cars after 20 years of hard service are referred to as the “back-bone of the system.” Frequent additions have been made to elevated and subway equipment so that the total rolling stock at the end of the fiscal year 1921 was as follows:
INTERBOROUGH RAPID TRANSIT ROLLING STOCK EQUIPMENT
| Manhattan Division | |
| Passenger Motor Cars | 1016 |
| Passenger Trailers | 721 |
| Service Motor Cars | 4 |
| Service Trailers | 56 |
| Elevated Extensions | |
| Passenger Motor Cars | 476 |
| Subway Division Contracts 1 & 2 | |
| Passenger Motor Cars | 785 |
| Passenger Trailers | 352 |
| Service Motor Cars | 10 |
| Service Trailers | 46 |
| Subway Division Contract 3 | |
| Passenger Motor Cars | 581 |
| Passenger Trailers | 217 |
| Service Motor Cars | 1 |
| Total Motor Cars | 2873 |
| Total Trailers | 1392 |
| Grand Total | 4265 |
The longest ride on the system for a single fare is from the terminus of the White Plains Road line at 241st St. near the Northern boundary of the city, the entire length of Manhattan and the Bronx and through the Eastern Parkway Subway to Linwood Avenue, a distance of about 26 miles. The maximum grades encountered are 4½ per cent.