Based on the available statistics for Dundalk racecourse over the last five years, I have assessed the best trainers with runners today as follows:

Twomey, P: With a win rate of 29% (5 wins from 17 runners) and a 53% place rate (9 placings), Twomey has the highest win percentage among the trainers listed. The profit/loss (P/L) stands at 3.22, indicating a positive return on investment.

O’Brien, A P: With 26% win rate (47 wins from 178 runners) and a 53% place rate (95 placings), O’Brien has a consistently strong performance. The P/L is 0.76, which is also positive.

O’Brien, Donnacha: Although the win rate is slightly lower at 24% (12 wins from 50 runners), Donnacha O’Brien has a decent place rate of 40% (20 placings). The impressive P/L of 15.21 suggests a strong return on investment.

Lynam, Edward: Lynam has a 15% win rate (45 wins from 306 runners) and a 37% place rate (113 placings). Despite a negative P/L of -20.2, the number of wins and placings make him a notable trainer in the list.

Dowling, Thomas: Despite having only 21 runners, Dowling has a 14% win rate (3 wins) and a 19% place rate (4 placings). The significant P/L of 65 indicates a potentially high return on investment.

These trainers have demonstrated good win and place rates, as well as a positive or at least reasonable P/L. It is important to consider factors like the quality of their runners today and their recent form before making any final decisions