inefficient, and the prevalence of one-man streetcars. The ERR's Superintendent argued that these issues were caused by a number of factors out of his control; it was hard to obtain parts during the war, service was slowed by the number of railway crossings streetcars had to stop at, and two-man streetcar service was too expensive. This was on top of an increase in the number of passengers, as veterans began returning from the war. Most streetcars were converted to allow for single-man operations by 1920, . In 1917 or 1918, crossovers were installed at both ends of the High Level Bridge, so that streetcars could cross the bridge on the left-hand track. Single-ended streetcars only had doors on their right side, and in the event that people had to evacuate a streetcar while it was on the bridge, driving on the left-hand track allowed for the doors to open onto the middle of the bridge deck, instead of its edge. Some streetcars remained double-ended, but were only operated by one person. The radial railway reached its greatest extent in 1920, with six full lines and two stub lines serving almost all sections of the city, and totaling in length. The railway's busiest confirmed year of service was in 1929, during-which it served approximately 14.1 million passengers; Edmonton had approximately 74,000 residents at the time. In subsequent years, transit officials did not distinguish between streetcar and bus passengers when tallying ridership figures. Three years later, in 1932, trolleybus service replaced streetcars on the 102 Avenue stub line. Deterioration during the Great Depression The Edmonton Radial Railway seldom turned a profit, despite its large ridership. This was largely because passengers tended to remain on the streetcars for long periods of time, and many routes went through sparsely populated parts of Edmonton, such as single-track portions that served meatpacking plants in the city's fringes. These factors limited the turnover rate of passengers, and thus capped the amount of fares that routes could generate. Edmonton could not afford to properly maintain the streetcar system during the Great Depression. Although maintenance crews did their best to keep the streetcars in good condition, old tracks and streetcars could not be replaced, and the system could not be expanded to keep up with the Edmonton's growth. City Council received a report from City Commissioner R.J. Gibbs in 1937 that detailed the deteriorating state of the streetcar system