The Detector - Tank is a block from the Railcraft mod. This block is meant to output a Redstone signal based on the type of Minecart that passes in front of it. The Detector - Tank will output a Redstone signal if a Tank Cart that matches the filter is in front of it. They can be placed under or beside Minecart Tracks, and will output a signal to the side that has a small square. When a Redstone signal is active this square will turn red.
Block Signal· Distant Signal· Dual-Head Block Signal· Signal Capacitor Box· Signal Controller Box· Analog Signal Controller Box· Switch Lever· Switch Motor· Signal Receiver Box· Signal Interlock Box· Routing Switch Motor· Signal Sequencer Box· Dual-Head Distant Signal· Signal Block Relay Box· Railway Ticket· Golden Railway Ticket