Crossties were introduced fairly early to hold the tracks in place. Gradually, however, it was realised that tracks would be more efficient if they had a stip of iron on the top. Here is the same text in Indonesian:
Bantalan rel diperkenalkan sejak awal untuk menahan trek pada tempatnya. Namun, perlahan disadari bahwa trek tersebut akan lebih efisien apabila memiliki lapisan besi pada bagian atasnya.