To address overcrowding, in 1909, the New York Public Service Commission proposed lengthening platforms at stations along the original IRT subway. As part of a modification to the IRT's construction contracts, made on January 18, 1910, the company was to lengthen station platforms to accommodate ten-car express and six-car local trains. In addition to $1.5 million (equivalent to $ million in ) spent on platform lengthening, $500,000 () was spent on building additional entrances and exits. It was anticipated that these improvements would increase capacity by 25 percent. The northbound platform at the Wall Street station was extended to the south, while the southbound platform was extended to the north. The southbound platform extension required installing new girders and columns at Trinity Church, while the northbound platform extension abutted the basements of adjacent properties. On January 23, 1911, ten-car express trains began running on the East Side Line, and the next day, ten-car express trains began running on the West Side Line.