to the R68A (including the former rollsigns on the R44 and R46 that now have LCD displays) have the route's bullet on the left side, and the two destinations on the right side. A rollsign on an R68 train may read: One change which precedes pre-unification has to do with the use of locality names. While these were discouraged during the 1960s after they had been inherited from private operators, many terminal stations are once again described by both a community and a street name; e.g., Inwood–207th Street for the northern destination of the A service, and Wakefield–241st Street for the northern destination of the 2 service. The JFK Express, started in 1978 and discontinued in 1990, used a turquoise bullet; this stayed through the color change. Route consistency Since the unsuccessful attempts at applying the briefly popular schematic theory of diagrammatic maps, line-by-line color-coding, and exclusive use of numbers and letters for service and line descriptions, the MTA has moved steadily toward a more traditional approach, with more geographically correct maps and use of traditional line and community names on maps and public signage. Concurrently, it has been refining its use of the number and letter system to try to achieve consistency across the system. One major push has been an attempt to have as many services as possible serve the same stations, routes and terminals at all times, with the major exception for most services being the early morning hours of approximately midnight to 5 a.m. For instance, the B and C swapped northern terminals in 1998 so the C could serve the entire local portion of the IND Eighth Avenue Line at all times except nights; previously, the A had made two local stops north of 145th Street on weekends, while being express on the whole line south of 145th Street, because the B did not operate in Manhattan on weekends. In another case, the MTA took advantage of unavoidable service changes forced by the partial Manhattan Bridge closures to swap the Brooklyn segments of the B and D services, with the B becoming the BMT Brighton Line express service and the D becoming the BMT West End Line local (previously the B had been the West End Local and the D the Brighton Local). This enabled the D, a full-time service, to operate continuously on the same route and terminals from Norwood–205th Street in the Bronx