THE OPEN-PLAN TUBE CARRIAGE

■ The Stock train that was targeted by the bomber yesterday can carry almost one thousand people - most of them standing.

■ They were the first London Underground trains to have walk through carriages - which means they have no connecting doors

■ The new rolling stock replaced ageing tube trains on the District Line - which had separate carriages and were built in the 1970s and 1980s.

■ In total, the new trains can hold up to 951 passengers, with just 256 seats and 695 standing.

■ The older D-stock trains had more seats but held just over 800 passengers, 20% f ewer.

■ In the UK similar trains also operate on the London Overground - which operates orbital commuter lines aroun d the capital

■ Walk-through trains are increasingly common around the world, including in Paris, New York, Toronto and Tokyo.