Simplify the following text for a Grade 5 native English-speaking person.
Original: In build and appearance , they are very similar to production , passenger carrying Shinkansen trains , and line inspection is carried out at full line speed ( i.e. up to 270 km\/h on the TÅ kaidÅ Shinkansen ) .
Simplified: The trains can go as fast as normal shinkansen trains , up to 270 km\/h on the TÅ kaidÅ Shinkansen ) .