The RAPID-L, RAPID-LAT (L: Lunar base, A: Automatic，T: Thermoelectric) is a micro nuclear reactor concept conceived as a powerhouse for colonies on the...

The Chicago "L" (short for "elevated") is the rapid transit system serving the city of Chicago and some of its surrounding suburbs in the U.S. state of...

Rapid-onset gender dysphoria (ROGD) is a controversial, scientifically unsupported hypothesis which claims that some adolescents identify as transgender...

Rapid transit or mass rapid transit (MRT), commonly referred to as metro, is a type of high-capacity public transport that is generally built in urban...

El train or L Train may refer to: An Elevated railway The Chicago "L", a rapid transit system The Market–Frankford Line in Philadelphia, commonly called...

Rapid intensification (RI) is any process wherein a tropical cyclone strengthens dramatically in a short period of time. Tropical cyclone forecasting...

A rapid reaction force / rapid response force (RRF), quick reaction force / quick response force (QRF), immediate reaction force (IRF), rapid deployment...

used today as part of the Green Line of the Chicago "L" system. The Chicago and South Side Rapid Transit Railroad Company was incorporated on January...

The L 14th Street–Canarsie Local is a rapid transit service in the B Division of the New York City Subway. Its route emblem, or "bullet", is colored medium...

The Chicago "L" is a rapid transit system that serves the city of Chicago and seven of its surrounding suburbs. The system is operated by the Chicago...