You make your way for the harbour; today is sunny, bright, and definitely reflective of your state of mind. The voyage is nigh, and it won't be short - but who can dim the overwhelming confidence radiating from you! You might even pass a callous comment or two at boys in suits and girls in petticoats; walking hand in hand as the cool breeze grazes the cityfolk. Indeed, you can't help but look around as you plan to bid goodbye to civilization for a while.

On your way, you witness the scene below.

Rajib and Ankita have just completed some meteorological measurements. They are resting on a knoll. A freight train is passing by, its locomotive fiercely fuming and huffing as it pulls the train up a slight incline. The wind wafts evenly without gusts along the railroad bed.

“What wind speed did our measurements show?" Ankita asked.
“Twenty miles per hour," said Rajib.
“That is enough to tell me the train's speed," Ankita remarked.
“Well now ..." Rajib seemed confused.
“All you have to do is watch the movement of the train a bit more closely," Ankita smiled.

What was the speed of the train in miles per hour? Just type in the number. Hint: take Ankita's advice.