A (train trip) can be from a world-city.Logical formLearned from21 sentences. A (train travel) can be unlimited.Logical formLearned from21 sentences. A train can be elegant.Logical formLearned from21 sentences. (Commuter trains) may undergo a bombing.Logical formLearned from21 sentences. The (train ground) can be to a halt.Logical formLearned from21 sentences. Trains may undergo movements.Logical formLearned from21 sentences. A train may be whistled.Logical formLearned from21 sentences. A (train journey) can be across a country.Logical formLearned from21 sentences. (Train tunnels) may pertain-to a US-city.Logical formLearned from21 sentences. (Train tunnels) can be underwater.Logical formLearned from21 sentences. Passengers may board a train.Logical formLearned from21 sentences. Victims may pertain-to a (train explosion).Logical formLearned from21 sentences. A bomb can be on a train.Logical formLearned from21 sentences. Some trains may be bounded for a station.Logical formLearned from21 sentences. A train can be at a (railway station).Logical formLearned from21 sentences.