Speedway - band - ended in 2004.
Speedway - band - was created in 2001.
Langhorne Speedway ended in 1971.
Islip Speedway ended in 1984.
Portland Speedway ended in 2001.
Nazareth Speedway ended in 2004.
Westboro Speedway ended in 1985.
Seminole Speedway ended in 1954.
Ontario Motor Speedway ended in 1980.
Asheville-Weaverville Speedway ended in 1987.
Memphis-Arkansas Speedway ended in 1957.
London Lions - speedway - ended in 1996.
Most diodes have a band (or marking), at one end. The band end is considered the positive end. You can also consider the "band" as a symbol of a gate or blockage. Power flowing from the non-band end to the band end will flow, but power flowing from the band end backwards will not. (That's my method that works for me).