Tokyo taxi passengers will soon be able to start paying for their rides using electronic money, three taxi fleet operators said this week.The deals, which involve BitWallet\u2019s Edy system and East Japan Railway Co.\u2019s (JR East) Suica system, are the latest in a string of agreements from major retailers to accept e-money in lieu of conventional cash for purchases and services. They come as technology for the systems, which are both based on Sony\u2019s Felica touch-and-go proximity smart card platform, is on the verge of becoming a standard feature in cell phones.This week\u2019s announcements mean that from August this year, all 2,552 taxis operated by Chuo Musen Taxi will begin accepting payment using Edy, and from next year, 2,798 taxis belonging to Nihon Kotsu and 2,242 taxis belonging to Kokusai Motorcars will accept payment by Suica e-cash. The three taxi operators are among the largest in Tokyo.After a slow start, e-money is rapidly gaining pace in Japan.Edy, which is backed by Sony, NTT DoCoMo and a number of other financial institutions, can be used in approximately 31,000 places in Japan including convenience stores, restaurants, department stores and karaoke centers. In addition to dedicated Edy cards, the feature is also built into some credit cards, airline mileage cards, office identification cards and (recently) cell phones. BitWallet says about 17 million Edy cards have been issued, of which about\u00a03 million are cell phones.The competing Suica system began as a prepaid travel pass for use on JR East trains in the Tokyo area, but it\u2019s been expanded to include an e-cash function. Almost 12 million Suica cards with the e-money support have been issued, and there are 5,700 places where they can be used. E-money transactions using Suica cards, not including travel use, currently total about 260,000 per day, said JR East.Both systems originally required plastic cards, although many cell phones are now available with Felica support built in. That means users can add Edy or Suica functions by just downloading the respective application for the phone. Because of the wide penetration of the Felica platform, it\u2019s also being used for other systems such as retail loyalty cards, and NTT DoCoMo recently began operating a Felica-based credit card payment system. Like the e-money service, it allows users to make payments with their phone and not bother with plastic cards.-Martyn Williams, IDG News ServiceCheck out our CIO News Alerts and Tech Informer pages for more updated news coverage.