Gas loses pressure as it travels long distances through pipelines. To ensure an even flow, and an adequate pressure at the point of off-take, it must be recompressed at compressor stations, typically located every 60 km to 100 km along onshore transmission pipelines. Offshore and in remote areas, it may be convenient and preferable to maintain higher pressures and allow greater distances between compressor stations. On large pipelines compressors are normally driven by gas turbines. Smaller pipelines may use diesel engines.