There was also a comparatively small mileage of 2 ft 6 in (762 mm) gauge line worked by the BB&CI on behalf of the Indian States.

Quadruple track mileage was 22 and double-track 250, the remainder of the system being single-track, whilst running powers were exercised over 147 miles (including the important section from Muttra Junction to Delhi, owned by the Great Indian Peninsular Railway).

The first train ran between Grant Road and Surat on 28 November 1864, and the Times of India gave a detailed report in the following day's issue.

Some of the Third Class coaches were double-deckers, which gave space for travellers to lie behind seated passengers, with some degree of comfort.

This plan was cut short after the liquidation of the Backbay Reclamation Company, following the end of the American Civil War.

[5] On 12 April 1867, a regular suburban rail service began from Bombay Backbay, to Viraur (present day Virar).

The stations on the route were: Bombay Backbay, Grant Road, Dadur (Dadar), Mahim, Bandora (Bandra), Santacruz, Andaru (Andheri), Pahadi (near Goregaon), Berewali (Borivali), Panjo (on the Panju island between the Vasai Creeks), Bassein Rd (Vasai Rd), Neela (Nallasopara), and finally, Viraur (Virar).

During the second phase of the 1860s Backbay Reclamation project, the Churchgate-Colaba line was removed and a new Bombay Central station was opened in 1930.

The metre-gauge system was originally the Rajputana Malwa State Railway and was taken over subsequently by the BB&CI.

It began at Ahmedabad and ran northwards through Baroda State and Rajputana via Abu, Ajmer, Jaipur and Rewari to Delhi.

There were branches from Rewari to Bhatinda and Fazilka, from Ajmer to Ratlam, Indore and Khandwa, and from Achnera to Cawnpore.

In 1936, electrification was extended to the two main tracks between Bandra and Borivali railway stations, left earlier and the two main tracks between Borivali and Virar railway stations were also electrified, resulting in completion of the electrification of the Churchgate-Virar section.