This is the case with the NX lines listed above. Supplemental numerical suffixes are used to differentiate route variations for lines that already use a lettered suffix. Used on Routes NX, NX1, NX2, NX3, NX4, NXC, and OX. X denotes Express service, where portions of the main route are skipped entirely.
R denotes Rapid service, which is limited-stop service with some bus rapid transit characteristics.L denotes Limited stop service, where not all local stops are served.C denotes Combined service, where portions of two or more routes are combined into a single route.Currently, A, B, C, L, M, R, S, and X are used. Suffixes (also lettered) are used to distinguish variations in route alignments. Lettered routes ( A-Z) provide Transbay service (i.e., service across a bridge) between the East Bay and San Francisco, San Mateo, and Santa Clara Counties. For example, Route 339 is "based" on Route 39. One- and two-digit route numbers are sometimes used as a "base" number for three-digit route numbers. 800-899 are part of the All Nighter network, which provides bus service during owl hours and at times when BART is not operating.700-799 are Early Bird Express lines, which are replacing early-morning BART service during a seismic retrofit of the Transbay Tube.600-699 operate primarily on school days only.300-399 serve combined portions of other bus lines, usually only at certain times of day or certain days of the week.200-299 serve the southern part of Alameda County and Milpitas.1-99 primarily serve the northwestern part of Contra Costa County and most of Alameda County.Numbered routes operate within the East Bay: The number and letter ranges listed below do not mean that all numbers or letters within a range are in use. Many Transbay routes continue to follow the original Key System alignments to some degree. Many Transbay rail lines were inherited from the Key System and converted to bus routes, and AC Transit continued to use letters to identify the routes. Since its inception in 1960, AC Transit has used both numbers and letters to distinguish routes. AC Transit bus routes are arranged in seven categories (six numbered, one lettered).
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