LXRA are stating that 2.0% is the maximum incline for the Frankston line.
A relatively new rail section allowing for a trench solution at Ormond and McKinnon which appears to accommodate a storm drain is 2.36%. Obviously, this is a safe operation or it would not have been built by LXRA. Advice from LXRA representatives is that this was a special case and needed special safety considerations and, yes, special safety considerations could again be applied.
A steeper incline CAN meet metro and freight rail standards for safe operation.