The SignallerA person responsible for the operation of the Signalling System, to safely control the passage and regulation of trains, usually located in a Signal Box. More can only pull the lever for the Section SignalA Stop Signal controlling the entrance to a Block Section or Intermediate Block Section ahead. See also Home Signal, Starting Signal, Advanced Starting Signal. More if Line ClearThe state of the Block Section after a train has been accepted but before it has entered the block section. More is
obtained from the box ahead. The lever is released either for One Pull or
One Train.