The text reads ותתנני (in the singular) לחן ולחסד....1

Whenever the Rebbe Rashab traveled to the countryside, he would recite Tikkun Leil Shavuos for the second time. After traveling some 2 1/2 miles he would call the coach to a halt, wash his hands (netilas yadayim), and recite the Prayer for Travelers. When traveling by wagon, he would remain seated while he recited it; when in a train he would stand.2

When he was away from home, even though he remained in the same place for several months, he would recite the Prayer for Travelers every day after the morning prayers, though without mentioning the Divine Name in the concluding blessing.3