Cloudy Railway Carriage Windows.

This is a phenonium seen on many heritage railway windows, over the years, iron brake dust has settled on to the glass and moisture has caused the brake dust to adhere and rust, causing occlusion on the glass.

This cannot be cleaned  off , it needs something more specific and more powerful.

This demonstration of  occlusion removal from the side window of the class 47 Diesel cab  at Toddington owned by Jack Boskett shows this.

If you enlarge the photo, You can see I have used rust remover, ( Phosphoric Acid)

to write the word, Jack on the glass,  it has removed the staining, making the glass bright and transparent again.

I would advise all heritage railways with cloudy carriage windows to try this method of removal,

Clear bright carriage windows will add to the visitor experience, and the answer is simple and straight forward.