Chasing Cassandra — Lisa Kleypas

Railway magnate Tom Severin is wealthy and powerful enough to satisfy any desire as soon as it arises. Anything—or anyone—is his for the asking. It should be simple to find the perfect wife—and from his first glimpse of Lady Cassandra Ravenel, he's determined to have her. But the beautiful and quick-witted Cassandra is equally determined to marry for love—the one thing he can't give.

Honestly, I don't read a lot of M/F romance these days, but this came highly recommended by a writing friend and it's been quite enjoyable so far. I also have a thing for railroad magnates - I'll read anything about them.