My understanding is that the union wouldn&#x27;t allow one-person train operation, but apparently the G and M are one-person only on weekends now, so maybe that&#x27;s changing: <a href="http:&#x2F;&#x2F;web.mta.info&#x2F;nyct&#x2F;service&#x2F;opto.htm" rel="nofollow">http:&#x2F;&#x2F;web.mta.info&#x2F;nyct&#x2F;service&#x2F;opto.htm</a><p>It also costs time (and money) to split up trains every day (10 cars into 5 cars, or 8 into 4), and so the MTA probably wouldn&#x27;t do that.<p>Finally, if all the railcars are being used 24&#x2F;7, there is no time to do routine maintenance on them.