ISLIP - Federal officials are calling on the Long Island Rail Road (LIRR) to increase its staffing on trains amid growing security concerns. This week, Reps. Peter King (R-Seaford) and Tim Bishop (D- Southampton), sent a letter to LIRR President Helena Williams, expressing alarm. "The security of these trains is essential because of the constant threat to our mass transit systems," King said in a statement.United Transportation Union Chairman Anthony Simon says more conductors can help police locate a train in case of an emergency. "They see the man in the uniform and they know he's got access to 911, central control, and everyone that can get to the train faster," he says. Larry Rubinstein, of the LIRR Commuter Council, takes the opposite view."If you see something, you're going to pick up the phone and dial 911," he says. "You're not going to take the time running through train cars to find a conductor."