All Block numbers are 4 digits. Block numbers are coded so that the first two (or 3) digits are the line number the bus spends the greatest portion of its day. The third digit is the day of service. The last digit is the number of buses on that particular line in pull-out order.
An E on the end signifies that a BEB is assigned to that particular Block. Block number displays to not show the E. This system applies to all lines, whether they are operated from a single division or multiple divisions.
There could be exceptions to this practice for the single digit line numbers or the Commuter service.
Breakdown of Block Number Components
The first two digits - Line number (Example (01, 43, 114); The third digit - Service Day Weekday - 0, Saturday - 5, Sunday - 7; The fourth digit - 0, 1, 2, 3
Examples:
0302 - Route 3, Weekday, 2nd bus; 1503 - Route 15, Weekday, 3rd bus; 4101E - Route 41, Weekday, 1st bus, BEB assigned; 1142 - Route 114, 2nd bus (Commuter Blocks do not use the Day type, as they only operate on Weekdays); 6452 - Route 64, Saturday, 2nd bus; 5571 - Route 55, Sunday, 1st bus