I see that MTA agencies (MaBSTOA, Bus Co, and NYCT) within New York City jurisdiction are always hiring but, other MTA agencies (LIRR, MNR, SIRTOA) are never hiring, what's the story behind this? Also, I've realize how agencies (NYCT, BUS CO, LIRR, MNR, and MTA Bridges and Tunnels ) don't allow any transfers or promotion from one another's agency (NYCT to LIRR), what's the story behind this?