While most DMUs need to comply with strict FRA crash requirements for simultaneous operation with freight railways, European-style DMUs are used with timesharing arrangements on several rail lines, including the RiverLINE in New Jersey. Only a handful of manufacturers in the United States produce or have produced FRA-compliant DMUs, including Colorado Railcar (now US Railcar) and Nippon Sharyo/Sumitomo Corporation. NJ Transit has experimented with this DMU on the Princeton Branch line. In August 2006 it was announced that Amtrak wants the State of Vermont to experiment with DMUs on the state-subsidized Vermonter line from New Haven north to St. Albans to replace the less efficient diesel locomotive trainsets currently used.