Sorry, I can see its confusing.
The Melissa and Doug set is the train set I'm talking about having 128 pieces. However, I've just checked and its actually 132 pieces. If you're from the US this is a good choice. If you click through to Amazon there are lots of reviews of this set which should help you make up your mind whether its a good choice for you.
The 101 piece set is a good option if you're from the UK as they don't sell the Melissa and Doug set here.
My son has a brio wooden train track which is good but they are expensive. Reading the reviews of other wooden trains, there are a lot of cheaper options out there which will probably be just as good with magnetic trains and wooden tracks.
I hope this helps.