Disadvantages thiab cov ntsiab lus ntawm rhuab phuam rails:

Piv nrog rau cov phuam da dej ib txwm muaj, lub tshuab hluav taws xob cua sov phuam rack siv hluav taws xob ntau thiab siv ntau qhov chaw. Hais txog kev hais lus, qhov kev nyab xeeb ntawm cov khoom siv hluav taws xob cua sov no yog qhov tsawg, thiab tus nqi kuj tseem kim. Cov ntsiab lus: Raws li cov khoom siv hluav taws xob tshiab, cov phuam da dej hluav taws xob tau txais kev siv tshuab ntau dua hauv kev tsim khoom thiab siv, yog li nws kuj yog ib qho kev siv niaj hnub no, thiab kuv ntseeg tias nws yuav dhau los ua kev zam.