"Without tracks?"
"On the ground."
"And at fifty miles an hour?"
"Yes. I have tested her to that speed."
"This, if true, is most extraordinary."
"No, it isn't. I have constructed such machines before."
"I've been told you are an inventor of electrical contrivances."
"Do you doubt the probability of such an engine?"
"Candidly, I do."
"Do you want me to prove it?"